|  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #77139 intval gives wrong results
Submitted: 2018-11-11 18:06 UTC Modified: 2018-11-11 18:16 UTC
From: markus at senoner dot com Assigned: cmb (profile)
Status: Not a bug Package: *Math Functions
PHP Version: Irrelevant OS: Linux (any)
Private report: No CVE-ID: None
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If this is not your bug, you can add a comment by following this link.
If this is your bug, but you forgot your password, you can retrieve your password here.
Bug Type:
From: markus at senoner dot com
New email:
PHP Version: OS:


 [2018-11-11 18:06 UTC] markus at senoner dot com
Please try:
echo intval(8.2*1000);
echo intval(8.2*100);
echo intval(8.2*10);
echo intval(8.2*1);

819   <--- this is wrong!

happens in PHP 7.2 as well as in PHP 5.X

If 819 is the result of an internal representation of 8.2 as 8.199999..., than why does the first operation in this example not give 8199 ?!?

Expected result:
8.2*100 should give 820, not 819


Add a Patch

Pull Requests

Add a Pull Request


AllCommentsChangesGit/SVN commitsRelated reports
 [2018-11-11 18:14 UTC] spam2 at rhsoft dot net
 [2018-11-11 18:16 UTC]
-Status: Open +Status: Not a bug -Assigned To: +Assigned To: cmb
 [2018-11-11 18:16 UTC]
Floating point values have a limited precision. Hence a value might 
not have the same string representation after any processing. That also
includes writing a floating point value in your script and directly 
printing it without any mathematical operations.

If you would like to know more about "floats" and what IEEE
754 is, read this:

Thank you for your interest in PHP.
PHP Copyright © 2001-2024 The PHP Group
All rights reserved.
Last updated: Thu Jul 18 17:01:29 2024 UTC